CA2287430C - Ink additives - Google Patents
Ink additives Download PDFInfo
- Publication number
- CA2287430C CA2287430C CA002287430A CA2287430A CA2287430C CA 2287430 C CA2287430 C CA 2287430C CA 002287430 A CA002287430 A CA 002287430A CA 2287430 A CA2287430 A CA 2287430A CA 2287430 C CA2287430 C CA 2287430C
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- CA
- Canada
- Prior art keywords
- ink
- cationic
- component
- additive
- cationic component
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
- C09D11/32—Inkjet printing inks characterised by colouring agents
- C09D11/322—Pigment inks
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inks, Pencil-Leads, Or Crayons (AREA)
- Coloring (AREA)
- Pigments, Carbon Blacks, Or Wood Stains (AREA)
Abstract
An additive for a pigment based ink-jet printing composition which is used i n conjunction with a printing head that comprises metallic components, is disclosed. The additive comprises a cationic compone nt and an anionic component, and characterized in that the cationic component is a cationic surfactant. Preferred additives are those where the cationic component is C10-22alkyl trimethyl ammonium. Pigment-based ink-jet printing compositions comprising these additive are al so described.
Description
WO 98!47972 PCTlIL98100182 INK ADDITIVES
FIELD OF THE INVENTION
The present invention relates to ink jet printing formulations and specifically it concerns pigment-based ink jet printing formulations that contain anti clogging agents.
BACKGROUND OF THE INVENTION
Ink jet printing is a well-known technique by which printing is done without establishing actual contact between the printing device and the substrate on which the printed matter is deposited. One such method comprises projecting a stream of droplets towards a surface, where the trajectories of the droplets are controlled electronically, thus obtaining the desired printed image. Another method of ink jet printing is to direct droplets on demand from a set of orifices onto a substrate which moves relatively to the set of orifices.
The ink compositions used in these devices, must meet various requirements concerning viscosity, surface tension, resistivity, solubility, wetability of the substrate, rapid drying and that they may pass through an ink jet orifice without crusting or clogging it. It should be understood that crusting and clogging these orifices is unacceptable because it reduces print WO 98!47972 PCT/8.98100182 quality by leaving a white, non-printed area on the substrate and ultimately leads to failure of the printer to print. When using pigments-based inks in ink jet printers, clogging was found to be an extremely severe problem due to extensive clogging caused by pigment aggregation.
In the past, a number of solutions suggesting ways to improve ink jet printing formulations, have been described.
US 5,431,720 discloses a quick-drying ink composition which has good penetrating property and preservation stability, and comprises water, a lubricant, a coloring agent and R-O(CH2CH20)mCH2COOM, where R is an alkyl group having 6 to 14 carbon atoms; M is a cation selected from among alkali metal ion, quaternary ammonium cation, quaternary phosphonium cation, alkanol amine cation, and m is an integer of 3 to 12.
US 5,102,458 discloses the incorporation of a CZ.~ alkyl amine into a non-aqueous, ink jet printing formulations so as to inhibit corrosion of metals which come into contact with the ink formulation.
US 5,106,417 teaches the use of an ink composition having impro-ved viscosity, where this composition comprises a solid pigment based on a polyacrylic resin, water dilutable organic solvent such as C~-C4-alkanols, lower aliphatic ketones and others, water and a humectant such as ethyleneglycol, diethylene glycol, triethylene glycol and the like.
US 5,494,759 discloses an ink jet printing formulation which comprises a support and an ink receiving layer containing a pigment, a hydrophilic binder comprising a mixture of polyvinyl alcohol, polyvinylpyr-rolidone and a vinyl acetate homopolymer and/or vinyl acetate alkyl acrylate copolymer, together with a quaternary ammonium compound. This composi-tion, according to US 5,494,759 assures a good waterfastness and web rub off properties, as well as high color density and image clarity.
A water soluble dye ink composition comprising an anionic dye component and a cationic dye counter ion, where the cationic dye counter ion is selected from among lithium, a quaternary ammonium and a quaternary ._..._..._~..-r......_. . .... ~ , T
WO 98147972 _ 3 _ PCTIIL98100182 phosphonium, is disclosed in US 5,462,592.
US 5,169,437 discloses a possible solution to the problem of crusting and clogging of the orifices by employing a humectant in the aqueous ink jet compositions. In accordance with this reference, including compounds such as ethylene glycol, propylene glycol, trimethylol propane, pentaethylene glycol, improves the ink composition by reducing the rate of evaporation.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide an additive for a pigment-based ink jet printing composition, capable of substantially reducing clogging in a printing head of an ink jet printer.
It is a further object of the present invention to provide a pigment-based ink jet printing composition comprising an additive which is capable of substantially reducing clogging in the printing head and corrosion of metal parts of the ink jet printing apparatus with which the printing ink composition comes into contact.
Other objects of the invention will become apparent as the description proceeds.
The present invention concerns an additive for a pigment based ink jet printing composition which is used in conjunction with a printing head that comprises metallic components, said additive comprising a cationic component and an anionic component, characterized in that the cationie component is a cationic surfactant.
The term "surfactant" as used hereinafter relates to a substance that, when present at low concentration in a system has a property of adsorbing onto surfaces or interfaces of the system and of altering to a marked degree the surface or interfacial free energies of those surfaces or interfaces.
Ink jet printing compositions which include pigments) therein, are in fact dispersions of pigments, where the pigment particles demonstrate a tendency to aggregate, thus clogging the ink jet orifices of the printer's print ,. ~ b,~ r . : .~.w.~.,,;,~..~:y head. The purpose of the present invention is to provide an additive that when added to an ordinary pigment-based ink jet printing composition, will retain the ink's properties while preventing the aggregation of the pigment's particles in the ink when subjected to interaction with the print head metallic side walls. This effect is achieved by adsorption of the long chain of the cationic surfactant to the pigments' surface, thus providing it with extra stability which overcomes and prevents the pigment coalescence, aggregation and consequently the clogging of the nozzles while the pigments interact with the printing head metallic side walls.
According to the preferred embodiment of the invention, the cationic component of the additive is an ammonium surfactant, preferably Clo-22 alkyl trimethyl ammonium.
According to another preferred embodiment of the invention, the anionic component of the additive is bromide, chloride and the like.
According to yet another preferred embodiment of the invention, the additive is C16H33(CH3)3NBr~
According to another aspect of the invention, there is provided a pigment-based ink jet printing composition comprising the additive of the invention as described above.
According to a further preferred embodiment of the invention, there is provided a pigment-based ink jet printing composition, in which the additive of the invention comprises about 0.05 to about 1 % by weight of the total composition weight, preferably from about 0.2 to about 0.4% by weight.
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 demonstrates the results obtained in a comparison test conducted to evaluate the performance of the additive of the present invention.
' wo Qs~4~2 _ 5 _ rcr~~m EXAMPLES
Ezample 1 Three pigment-based jet-inks were compared by passing each through four printing heads, where each one of the heads comprised 48 nozzles. The details of printing heads used, are to be found in Israeli Patent No. IL 119944. The first jet ink was a standard solvent based magenta pigmented ink supplied by Marabu, Germany, which was also used as a basis for the other two inks (to be referred to hereinafter as "ink no. 1"). The second ink .tested was a modification of said ink no. 1, wherein 0.2% by weight of an anionic surfactant of the type of primary ester of phosphoric acid (mono-tetradecyl phosphate salt) was added to ink no. 1, and the third ink tested was ~
composition comprising ink no. l, to which 03% by weight of C16H33WH3~3~r W~ added. The additives were mixed with the ink up to complete dissolution, prior to their use. All heads operated throughout the test under identical conditions. The number of non-operatjng nozzles was recorded as a function of time, and when the experiment was concluded, it was verified that all the nozzles which did not operate, could be operative again once the clogging has been removed.
Figure 1. presents the results obtained after one month of operation. In the performance evaluation, heads which had already been in use, were tested. Therefore, some nozzles were already clogged when the test started, hence the graphs presenting the number of clogged nozzles do not start from zero nozzles failed. It may clearly be seen from the Figure, that ali the nozzles through which ink of the first and second types were jetted, were clogged within 23 days of operation, while at that time only about 8% of the nozzles through which ink of the third type was jetted, were clogged.
' wo 9s~4~n~z _ ~ _ pcr~sroois2 Example 2 A printing head type Idanit Ad162 was immersed in 6 types of pigment-based jet inks. The first three being those described under Example 1, whereas the other three were yellow pigment based ink, cyan pigment based ink and black pigment based ink.
It was found that when immersed in each of these inks, with the exception of ink no. 3 which comprised 0.3% by weight of C~6H33(CH3)3NBr additive, the heads exhibited severe pitting and corrosion of the metallic parts of the printing head which were in direct contact with the ink. At the same time large° ink aggregates (in the order of 100 to 500) accumulate on the inner side walls of the printing heads after 5 days from the start of the test When the head which was immersed in ink no. 1 to which 0.3% by weight of C~6H33(CH3)3NBr was added, was examined after 21 days, none of the above described phenomena were observed.
FIELD OF THE INVENTION
The present invention relates to ink jet printing formulations and specifically it concerns pigment-based ink jet printing formulations that contain anti clogging agents.
BACKGROUND OF THE INVENTION
Ink jet printing is a well-known technique by which printing is done without establishing actual contact between the printing device and the substrate on which the printed matter is deposited. One such method comprises projecting a stream of droplets towards a surface, where the trajectories of the droplets are controlled electronically, thus obtaining the desired printed image. Another method of ink jet printing is to direct droplets on demand from a set of orifices onto a substrate which moves relatively to the set of orifices.
The ink compositions used in these devices, must meet various requirements concerning viscosity, surface tension, resistivity, solubility, wetability of the substrate, rapid drying and that they may pass through an ink jet orifice without crusting or clogging it. It should be understood that crusting and clogging these orifices is unacceptable because it reduces print WO 98!47972 PCT/8.98100182 quality by leaving a white, non-printed area on the substrate and ultimately leads to failure of the printer to print. When using pigments-based inks in ink jet printers, clogging was found to be an extremely severe problem due to extensive clogging caused by pigment aggregation.
In the past, a number of solutions suggesting ways to improve ink jet printing formulations, have been described.
US 5,431,720 discloses a quick-drying ink composition which has good penetrating property and preservation stability, and comprises water, a lubricant, a coloring agent and R-O(CH2CH20)mCH2COOM, where R is an alkyl group having 6 to 14 carbon atoms; M is a cation selected from among alkali metal ion, quaternary ammonium cation, quaternary phosphonium cation, alkanol amine cation, and m is an integer of 3 to 12.
US 5,102,458 discloses the incorporation of a CZ.~ alkyl amine into a non-aqueous, ink jet printing formulations so as to inhibit corrosion of metals which come into contact with the ink formulation.
US 5,106,417 teaches the use of an ink composition having impro-ved viscosity, where this composition comprises a solid pigment based on a polyacrylic resin, water dilutable organic solvent such as C~-C4-alkanols, lower aliphatic ketones and others, water and a humectant such as ethyleneglycol, diethylene glycol, triethylene glycol and the like.
US 5,494,759 discloses an ink jet printing formulation which comprises a support and an ink receiving layer containing a pigment, a hydrophilic binder comprising a mixture of polyvinyl alcohol, polyvinylpyr-rolidone and a vinyl acetate homopolymer and/or vinyl acetate alkyl acrylate copolymer, together with a quaternary ammonium compound. This composi-tion, according to US 5,494,759 assures a good waterfastness and web rub off properties, as well as high color density and image clarity.
A water soluble dye ink composition comprising an anionic dye component and a cationic dye counter ion, where the cationic dye counter ion is selected from among lithium, a quaternary ammonium and a quaternary ._..._..._~..-r......_. . .... ~ , T
WO 98147972 _ 3 _ PCTIIL98100182 phosphonium, is disclosed in US 5,462,592.
US 5,169,437 discloses a possible solution to the problem of crusting and clogging of the orifices by employing a humectant in the aqueous ink jet compositions. In accordance with this reference, including compounds such as ethylene glycol, propylene glycol, trimethylol propane, pentaethylene glycol, improves the ink composition by reducing the rate of evaporation.
SUMMARY OF THE INVENTION
It is therefore the object of the present invention to provide an additive for a pigment-based ink jet printing composition, capable of substantially reducing clogging in a printing head of an ink jet printer.
It is a further object of the present invention to provide a pigment-based ink jet printing composition comprising an additive which is capable of substantially reducing clogging in the printing head and corrosion of metal parts of the ink jet printing apparatus with which the printing ink composition comes into contact.
Other objects of the invention will become apparent as the description proceeds.
The present invention concerns an additive for a pigment based ink jet printing composition which is used in conjunction with a printing head that comprises metallic components, said additive comprising a cationic component and an anionic component, characterized in that the cationie component is a cationic surfactant.
The term "surfactant" as used hereinafter relates to a substance that, when present at low concentration in a system has a property of adsorbing onto surfaces or interfaces of the system and of altering to a marked degree the surface or interfacial free energies of those surfaces or interfaces.
Ink jet printing compositions which include pigments) therein, are in fact dispersions of pigments, where the pigment particles demonstrate a tendency to aggregate, thus clogging the ink jet orifices of the printer's print ,. ~ b,~ r . : .~.w.~.,,;,~..~:y head. The purpose of the present invention is to provide an additive that when added to an ordinary pigment-based ink jet printing composition, will retain the ink's properties while preventing the aggregation of the pigment's particles in the ink when subjected to interaction with the print head metallic side walls. This effect is achieved by adsorption of the long chain of the cationic surfactant to the pigments' surface, thus providing it with extra stability which overcomes and prevents the pigment coalescence, aggregation and consequently the clogging of the nozzles while the pigments interact with the printing head metallic side walls.
According to the preferred embodiment of the invention, the cationic component of the additive is an ammonium surfactant, preferably Clo-22 alkyl trimethyl ammonium.
According to another preferred embodiment of the invention, the anionic component of the additive is bromide, chloride and the like.
According to yet another preferred embodiment of the invention, the additive is C16H33(CH3)3NBr~
According to another aspect of the invention, there is provided a pigment-based ink jet printing composition comprising the additive of the invention as described above.
According to a further preferred embodiment of the invention, there is provided a pigment-based ink jet printing composition, in which the additive of the invention comprises about 0.05 to about 1 % by weight of the total composition weight, preferably from about 0.2 to about 0.4% by weight.
BRIEF DESCRIPTION OF THE DRAWING
Fig. 1 demonstrates the results obtained in a comparison test conducted to evaluate the performance of the additive of the present invention.
' wo Qs~4~2 _ 5 _ rcr~~m EXAMPLES
Ezample 1 Three pigment-based jet-inks were compared by passing each through four printing heads, where each one of the heads comprised 48 nozzles. The details of printing heads used, are to be found in Israeli Patent No. IL 119944. The first jet ink was a standard solvent based magenta pigmented ink supplied by Marabu, Germany, which was also used as a basis for the other two inks (to be referred to hereinafter as "ink no. 1"). The second ink .tested was a modification of said ink no. 1, wherein 0.2% by weight of an anionic surfactant of the type of primary ester of phosphoric acid (mono-tetradecyl phosphate salt) was added to ink no. 1, and the third ink tested was ~
composition comprising ink no. l, to which 03% by weight of C16H33WH3~3~r W~ added. The additives were mixed with the ink up to complete dissolution, prior to their use. All heads operated throughout the test under identical conditions. The number of non-operatjng nozzles was recorded as a function of time, and when the experiment was concluded, it was verified that all the nozzles which did not operate, could be operative again once the clogging has been removed.
Figure 1. presents the results obtained after one month of operation. In the performance evaluation, heads which had already been in use, were tested. Therefore, some nozzles were already clogged when the test started, hence the graphs presenting the number of clogged nozzles do not start from zero nozzles failed. It may clearly be seen from the Figure, that ali the nozzles through which ink of the first and second types were jetted, were clogged within 23 days of operation, while at that time only about 8% of the nozzles through which ink of the third type was jetted, were clogged.
' wo 9s~4~n~z _ ~ _ pcr~sroois2 Example 2 A printing head type Idanit Ad162 was immersed in 6 types of pigment-based jet inks. The first three being those described under Example 1, whereas the other three were yellow pigment based ink, cyan pigment based ink and black pigment based ink.
It was found that when immersed in each of these inks, with the exception of ink no. 3 which comprised 0.3% by weight of C~6H33(CH3)3NBr additive, the heads exhibited severe pitting and corrosion of the metallic parts of the printing head which were in direct contact with the ink. At the same time large° ink aggregates (in the order of 100 to 500) accumulate on the inner side walls of the printing heads after 5 days from the start of the test When the head which was immersed in ink no. 1 to which 0.3% by weight of C~6H33(CH3)3NBr was added, was examined after 21 days, none of the above described phenomena were observed.
Claims (12)
1. Use of an additive comprising a cationic component and an anionic component for preventing clogging in a pigment based ink jet printing composition which is used in conjunction with a printing head that comprises metallic components, said cationic component being a cationic surfactant in an amount from about 0.05 to about 1% by weight of the total composition weight.
2. The use according to claim 1, wherein said cationic component of said additive is an ammonium surfactant.
3. The use according to claim 2, wherein said cationic component is C10-22 alkyl trimethyl ammonium.
4. The use according to claim 1, wherein said additive is C16H33(CH3)3NBr.
5. The use according to claim 1, wherein said additive constitutes from about 0.2 to about 0.4% by weight of the total composition weight.
6. A method for substantially reducing clogging and pitting in an ink jet print head, the method comprising:
adding to an ink a cationic component and an anionic component, wherein said cationic component is a cationic surfactant;
passing said ink with said cationic component and said anionic component through said ink jet print head, wherein clogging and pitting is substantially reduced.
adding to an ink a cationic component and an anionic component, wherein said cationic component is a cationic surfactant;
passing said ink with said cationic component and said anionic component through said ink jet print head, wherein clogging and pitting is substantially reduced.
7. The method according to claim 6, wherein said ink has a non-aqueous primary solvent.
8. The method according to claim 6, wherein said cationic component is an alkyl ammonium surfactant.
9. The method according to claim 8, wherein said cationic component is C10-22 alkyl trimethyl ammonium.
10. The method according to Claim 9, wherein said cationic surfactant is C16H33(CH3)3NBr.
11. The method according to Claim 6, wherein said cationic component and said anionic component constitute from about 0.05% to about 1% by weight of the ink.
12. The ink method according to Claim 11, wherein said cationic component and said anionic component constitute from about 0.2% to about 0.4% by weight of the ink.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IL120698 | 1997-04-18 | ||
| IL12069897A IL120698A0 (en) | 1997-04-18 | 1997-04-18 | Ink additives |
| PCT/IL1998/000182 WO1998047972A1 (en) | 1997-04-18 | 1998-04-15 | Ink additives |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2287430A1 CA2287430A1 (en) | 1998-10-29 |
| CA2287430C true CA2287430C (en) | 2005-08-09 |
Family
ID=11070055
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002287430A Expired - Fee Related CA2287430C (en) | 1997-04-18 | 1998-04-15 | Ink additives |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6652639B1 (en) |
| EP (1) | EP0975700B1 (en) |
| AU (1) | AU6933398A (en) |
| CA (1) | CA2287430C (en) |
| DE (1) | DE69839146T2 (en) |
| IL (1) | IL120698A0 (en) |
| WO (1) | WO1998047972A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1464684A4 (en) | 2002-01-08 | 2006-11-15 | Ricoh Kk | Ink set,ink-jet recording method, and recorder |
| US6986572B2 (en) * | 2002-07-30 | 2006-01-17 | Hewlett-Packard Development Company, L.P. | Use of cationic surfactant to improve print quality of dyebased inkjet inks |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4783220A (en) | 1986-12-18 | 1988-11-08 | Xerox Corporation | Vesicle ink compositions |
| EP0425439B1 (en) | 1989-10-26 | 1995-08-02 | Ciba-Geigy Ag | Aqueous printing ink for ink-jet printing |
| US5102458A (en) | 1991-04-16 | 1992-04-07 | Videojet Systems International, Inc. | Corrosion inhibitor for jet inks |
| US5106416A (en) * | 1991-08-28 | 1992-04-21 | Hewlett-Packard Company | Bleed alleviation using zwitterionic surfactants and cationic dyes |
| US5169437A (en) | 1991-10-24 | 1992-12-08 | Hewlett-Packard Company | Water based ink compositions exhibiting reduced crusting, clogging and kogation |
| US5209998A (en) * | 1991-11-25 | 1993-05-11 | Xerox Corporation | Colored silica particles |
| US5462592A (en) | 1992-06-09 | 1995-10-31 | Ricoh Company, Ltd. | Aqueous ink composition |
| JP3176444B2 (en) | 1992-10-01 | 2001-06-18 | 株式会社リコー | Aqueous ink and recording method using the same |
| DE4322178C2 (en) | 1993-07-03 | 1996-11-07 | Schoeller Felix Jun Papier | Recording material for ink jet printing processes |
| US5679724A (en) * | 1995-09-29 | 1997-10-21 | Xerox Corporation | Submicron particles for ink jet inks |
| US5891232A (en) * | 1997-10-28 | 1999-04-06 | Hewlett-Packard Company | Smearfastness and fast drying times in inks containing macromolecular chromophores |
| US6036759A (en) * | 1998-04-30 | 2000-03-14 | Hewlett-Packard Company | Black to color bleed control in ink-jet printing inks |
-
1997
- 1997-04-18 IL IL12069897A patent/IL120698A0/en unknown
-
1998
- 1998-04-15 CA CA002287430A patent/CA2287430C/en not_active Expired - Fee Related
- 1998-04-15 AU AU69333/98A patent/AU6933398A/en not_active Abandoned
- 1998-04-15 US US09/403,245 patent/US6652639B1/en not_active Expired - Fee Related
- 1998-04-15 DE DE69839146T patent/DE69839146T2/en not_active Expired - Lifetime
- 1998-04-15 WO PCT/IL1998/000182 patent/WO1998047972A1/en active IP Right Grant
- 1998-04-15 EP EP98915065A patent/EP0975700B1/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| EP0975700B1 (en) | 2008-02-20 |
| EP0975700A1 (en) | 2000-02-02 |
| WO1998047972A1 (en) | 1998-10-29 |
| DE69839146D1 (en) | 2008-04-03 |
| DE69839146T2 (en) | 2009-02-19 |
| CA2287430A1 (en) | 1998-10-29 |
| US6652639B1 (en) | 2003-11-25 |
| IL120698A0 (en) | 1997-08-14 |
| AU6933398A (en) | 1998-11-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20140415 |